/* $NetBSD: _strtoul.h,v 1.11 2017/07/06 21:08:44 joerg Exp $ */

/*-
 * Copyright (c) 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * Original version ID:
 * NetBSD: src/lib/libc/locale/_wcstoul.h,v 1.2 2003/08/07 16:43:03 agc Exp
 */

/*
 * function template for strtoul, strtoull and strtoumax.
 *
 * parameters:
 *      _FUNCNAME  : function name
 *      __UINT     : return type
 *      __UINT_MAX : upper limit of the return type
 */
#if defined(_KERNEL) || defined(_STANDALONE) || \
    defined(HAVE_NBTOOL_CONFIG_H) || defined(BCS_ONLY)
__UINT
_FUNCNAME(const char *nptr, char **endptr, int base)
#else
#include <locale.h>
#include "setlocale_local.h"
#define INT_FUNCNAME_(pre, name, post)  pre ## name ## post
#define INT_FUNCNAME(pre, name, post)   INT_FUNCNAME_(pre, name, post)

static __UINT
INT_FUNCNAME(_int_, _FUNCNAME, _l)(const char *nptr, char **endptr,
                                   int base, locale_t loc)
#endif
{
        const char *s;
        __UINT acc, cutoff;
        unsigned char c;
        int i, neg, any, cutlim;

        _DIAGASSERT(nptr != NULL);
        /* endptr may be NULL */

        /* check base value */
        if (base && (base < 2 || base > 36)) {
#if !defined(_KERNEL) && !defined(_STANDALONE)
                errno = EINVAL;
                if (endptr != NULL)
                        /* LINTED interface specification */
                        *endptr = __UNCONST(nptr);
                return 0;
#else
                panic("%s: invalid base %d", __func__, base);
#endif
        }

        /*
         * Skip white space and pick up leading +/- sign if any.
         * If base is 0, allow 0x for hex and 0 for octal, else
         * assume decimal; if base is already 16, allow 0x.
         */
        s = nptr;
#if defined(_KERNEL) || defined(_STANDALONE) || \
    defined(HAVE_NBTOOL_CONFIG_H) || defined(BCS_ONLY)
        do {
                c = *s++;
        } while (isspace(c));
#else
        do {
                c = *s++;
        } while (isspace_l(c, loc));
#endif
        if (c == '-') {
                neg = 1;
                c = *s++;
        } else {
                neg = 0;
                if (c == '+')
                        c = *s++;
        }
        if ((base == 0 || base == 16) &&
            c == '0' && (*s == 'x' || *s == 'X') &&
            ((s[1] >= '0' && s[1] <= '9') ||
             (s[1] >= 'a' && s[1] <= 'f') ||
             (s[1] >= 'A' && s[1] <= 'F'))) {
                c = s[1];
                s += 2;
                base = 16;
#if 0
        } else if ((base == 0 || base == 2) &&
            c == '0' && (*s == 'b' || *s == 'B') &&
            (s[1] >= '0' && s[1] <= '1')) {
                c = s[1];
                s += 2;
                base = 2;
#endif
        } else if (base == 0)
                base = (c == '0' ? 8 : 10);

        /*
         * See strtol for comments as to the logic used.
         */
        cutoff = ((__UINT)__UINT_MAX / (__UINT)base);
        cutlim = (int)((__UINT)__UINT_MAX % (__UINT)base);
        for (acc = 0, any = 0;; c = *s++) {
                if (c >= '0' && c <= '9')
                        i = c - '0';
                else if (c >= 'a' && c <= 'z')
                        i = (c - 'a') + 10;
                else if (c >= 'A' && c <= 'Z')
                        i = (c - 'A') + 10;
                else
                        break;
                if (i >= base)
                        break;
                if (any < 0)
                        continue;
                if (acc > cutoff || (acc == cutoff && i > cutlim)) {
                        acc = __UINT_MAX;
#if !defined(_KERNEL) && !defined(_STANDALONE)
                        any = -1;
                        errno = ERANGE;
#else
                        any = 0;
                        break;
#endif
                } else {
                        any = 1;
                        acc *= (__UINT)base;
                        acc += i;
                }
        }
        if (neg && any > 0)
                acc = -acc;
        if (endptr != NULL)
                /* LINTED interface specification */
                *endptr = __UNCONST(any ? s - 1 : nptr);
        return(acc);
}

#if !defined(_KERNEL) && !defined(_STANDALONE) && \
    !defined(HAVE_NBTOOL_CONFIG_H) && !defined(BCS_ONLY)
__UINT
_FUNCNAME(const char *nptr, char **endptr, int base)
{
        return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, _current_locale());
}

__UINT
INT_FUNCNAME(, _FUNCNAME, _l)(const char *nptr, char **endptr, int base, locale_t loc)
{
        return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, loc);
}
#endif